Malicious PDF — malware analysis report

Static analysis result for SHA-256 01d696cea22429a3…

MALICIOUS

PDF

38.7 KB Created: 2020-08-31 10:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: caf6a67d0bb64b28623a99bc8d1e2311 SHA-1: 08a3188f7dbc70baea338d96ba68e3fcd08fe9a6 SHA-256: 01d696cea22429a318a70676fc4a255f19c7a27a2fa8456e517bbc08f45b2845
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded URLs that point to a malicious redirector, which in turn hosts a link farm of other PDFs. The document body, though heavily obfuscated, contains text related to an offer letter, suggesting a social engineering lure. The presence of multiple external PDF links indicates an attempt to obscure the ultimate malicious destination and potentially distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/wix?keyword=accepting+offer+letter+mail+example
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6747/4087/files/dasevebipoga.pdf
    • https://cdn.shopify.com/s/files/1/0433/7162/6652/files/tekilodo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3694/2234/files/esl_short_stories_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0433/4495/3509/files/86873661257.pdf
    • https://cdn.shopify.com/s/files/1/0432/7368/3100/files/11347146280.pdf
    • https://static.usrfiles.com/ugd/c3f88d_b610c17ed96545db97ba82987a09e024.pdf
    • https://static.usrfiles.com/ugd/0a052f_573232c9cd22419c951d08792c56f04a.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/72534900240.pdf
    • https://cdn.shopify.com/s/files/1/0435/9149/9935/files/great_barrier_reef_foundation_annual_report_2018.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c3c.bin
658b00548b8c57914e19910b8b006f134a48d544a561bd5b7124657c5b6a113c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C3C 5212 bytes
font_01_sfnt_off00006ddf.bin
179ce95bef448ecb0c27fb49dc41788ba57e79fb24c0f43aa39ee2e427d5fe3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DDF 9608 bytes

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